Hi, looks like your rudbeckia has spontaneously morphed into a new shape. I have not seen one like you have and I visit nurseries all the time . I have some larkspur that has done the same thing . Mostly what grows here is a single purple form but I have some pale pink , pink , deep pink with white stripes and a deep purple double that have developed by spontaneously mutating . I will collect seed this year from these and time will tell if the seeds produce the morphed variety or revert back to the ordinary purple. Love the look of your new form!!!!!!!!!!
